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using two subcarriers and a main carrier signal
- audio subcarrier is frequency modulated with audio
- color subcarrier is phase modulated with chroma
- main carrier is amplitude modulated with sum of video and modulated audio subcarrier & color subcarrier; then lower sideband is suppressed by a filter.
- closed captions are serial ASCII encoded characters embedded in vertical blanking of video signal
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoYes, but only with a digital tv set-top converter box.
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What are the differences between analog and digital modems?
Analog modems use the telephone cable to send audio signals, which represent 1's and 0's over a connected phone line, using phone voltages. Digital modems use a high frequency signal with the data superimposed on it. They can use the copper phone wires like an antenna. In this way there does not have to be phone connection in use. The phone can be used as well as the signal, if a filter is used to stop interference. Digital modems can also use fibre optic or coaxial cables.
What is different between digital and analog?
Consider this:You want so signal your friend using a torch light. Now you might think there is only one way to signal to your friend by turning on and off the flashlight right? But actually there are more ways.1) Turning on and off the flashlight2) Dimming the torchlight and bringing it back to full shineSo here method 1) is the digital way to signal to your friend and method 2) is the analog way to signal to your friend.Difference: In method one its either full signal or null as in case of digital signal 0 or 1In method two there is always signal(torch is always glowing) but we are signaling by dimming the glow of light.cheers,...kamIn electronics, the term "digital" refers to circuits in which individual data are represented by a discrete set of voltages -- usually only two (i.e., either a "logic 1" or a "logic 0"). In this case, each datum is a binary entity called a bit. Data in the form of numbers other than 0 or 1 (e.g., 2, 365, 3.14159, etc.) are represented as patterns of bits.In analog circuits, each datum is encoded as a continuous voltage within a range. Such circuits are widely used in such application areas as audio electronics, radio, motor control, etc.Historically (c. 1960), analog computers were developed that competed with digital computers. However, digital circuits are at the heart of virtually all modern computers.
What is the difference between digital and analog signals?
Digital/Analog An analog or analog signal is any time continuous signal where some time varying feature of the signal is a representation of some other time varying quantity. It differs from a digital signal in that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical context, however mechanical, pneumatic, hydraulic, and other systems may also convey analog signals. An analog signal uses some property of the medium to convey the signal's information. For example, an aneroid barometer uses rotary position as the signal to convey pressure information. Electrically, the property most commonly used is voltage followed closely by frequency, current, and charge. Any information may be conveyed by an analog signal, often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure, and is achieved using a transducer. For example, in sound recording, fluctuations in air pressure (that is to say, sound) strike the diaphragm of a microphone which causes corresponding fluctuations in a voltage or the current in an electric circuit. The voltage or the current is said to be an "analog" of the sound. Since an analog signal has a theoretically infinite resolution, it will always have a higher resolution than any digital system where the resolution is in discrete steps. In practice, as analog systems become more complex, effects such as nonlinearity and noise ultimately degrade analog resolution such that digital systems surpass it. In analog systems, it is difficult to detect when such degradation occurs, but in digital systems, degradation can not only be detected but corrected as well. Disadvantage The primary disadvantage of analog signaling is that any system has noise - i.e., random variation. As the signal is copied and re-copied, or transmitted over long distances, these random variations become dominant. Electrically, these losses can be diminished by shielding, good connections, and several cable types such as coaxial or twisted pair. The effects of noise make signal loss and distortion impossible to recover, since amplifying the signal to recover attenuated parts of the signal amplifies the noise as well. Even if the resolution of an analog signal is higher than a comparable digital signal, in many cases, the difference is overshadowed by the noise in the signal Digital The term digital signal is used to refer to more than one concept. It can refer to discrete-time signals that are digitized, or to the waveform signals in a digital system. Digital signals are digital representations of discrete-time signals, which are often derived from analog signals. An analog signal is a datum that changes over time-say, the temperature at a given location; the depth of a certain point in a pond; or the amplitude of the voltage at some node in a circuit that can be represented as a mathematical function, with time as the free variable (abscissa) and the signal itself as the dependent variable (ordinate). A discrete-time signal is a sampled version of an analog signal: the value of the datum is noted at fixed intervals (for example, every microsecond) rather than continuously. If individual time values of the discrete-time signal, instead of being measured precisely (which would require an infinite number of digits), are approximated to a certain precision-which, therefore, only requires a specific number of digits-then the resultant data stream is termed a digital signal. The process of approximating the precise value within a fixed number of digits, or bits, is called quantization. In conceptual summary, a digital signal is a quantized discrete-time signal; a discrete-time signal is a sampled analog signal. In the Digital Revolution, the usage of digital signals has increased significantly. Many modern media devices, especially the ones that connect with computers use digital signals to represent signals that were traditionally represented as continuous-time signals; cell phones, music and video players, personal video recorders, and digital cameras are examples. In most applications, digital signals are represented as binary numbers, so their precision of quantization is measured in bits. Suppose, for example, that we wish to measure a signal to two significant decimal digits. Since seven bits, or binary digits, can record 128 discrete values (viz., from 0 to 127), those seven bits are more than sufficient to express a range of one hundred values. Summary: Digital communication systems offer much more efficiency, better performance, and much greater the flexibility. Analog in a watch is where you have to read the numbers. Digital shows the numbers for you. a digital signal is what a computer system is based around; mainly zeros and ones / or noughts and ones as illustrated. a zero equates to zero volts approx . a one ( logic ) is 5 volts +_ a tolerance value. but there is limited range of signal in between these 2 points. a measured value of 2.5 volts would not be equal to either a logic 1 or nought . .... when a circuit / usually a transistor device switches on or off the voltage at its terminal usually changes from zero to 5 volts or logic 1 . the digital circuit only recognizes values at or around these 2 points and interprets them as a logic 1 or 0. .. in the case of the analog signal, the value could change between a negative value to positive or from zero to a positive value, within the supply constraints and still be recognized.
Which cable connector type commonly supports both digital and analog video signals?
Both common 'TV Coax' and 'Type F' cable connectors are commonly used to support both digital and analog video signals. Plain TV coax connectors (male and female) can easily be taken apart by anyone without having to use any tools, so they are commonly used for making simple cable connections for tv antennas and digital tv set-top boxes. Type F (male and female) connectors use screw threads so that, by using simple tools such as wrenches and/or hand pliers, they can be tightened-up too hard to be loosened and disconnected by hand. That is why Type F connectors are regularly used for making signal connections for cable and satellite tv systems and for computer broadband cable systems.
Max length for a digital coxial cable?
This depends on the signal and the type of cable. Standard definition digital video signals can be run for 1000 feet or more with low loss broadcast standard cable. HD is limited to around 400 feet with the same cable. However, there are always lower loss cables available to extend the maximum distance. In the home, co-ax cables are often good for in excess of 100 feet although it depends very much on the signal source, the receiver and the cable itself.
Will your digital television that's receiving an analog signal from comcast be a clear picture digital signal when you go digital in 2009?
Only if you have a digital output on your cable box. If not, it'll end up being a digital signal, converted to analog and then reconverted by your TV back to digital. Besides, the digital changeover date is only for local television stations when they turn off their analog transmitters. This means that if you currently have cable or satellite with analog outp[uts, that aspect of it shouldn't change.
What does an HDMI connection look like?
As compared to what? Are you talking analog cable or digital cable? Are you comparing it to an analog signal over the air or a satellite receiver?
Is there an spdif analog audio out?
No, a S/PDIF is, by definition, a Sony / Phillips Digital Interconnect Format connector, and is always a digital signal. It is usually connected by an RCA cable, and can be carried by cable specified for analog use, but digital cable is better.
Which device is used to convert digital signals to analog signals or analog signals to digital signals?
The set top box that your provider gives you is what converts the Digital signal to the analog signal. The digital signal is compressed at the provider and sent to the end user. The "tuner" (which can be built into a tv, a set top box or a cable card) Then decompresses the digital signal and converts it into an analog signal. There is much more to this did not know how technical you wanted your answer.
What is the form of the signal in twisted pair cable and coxial cable?
Twisted pair wiring is a digital signal.Coaxial cable is an analog signal.
Are analog t.v.s completely obsolete now?
No, you can still use an analog TV, but you will need a converter box to receive digital cable.
What is the Difference between HDTV and regular tv?
The difference between digital cable TV and regular cable TV is the quality of the video stream that is being presented on the TV screen. A digital cable will provide a better quality picture, usually with a larger framerate and bitrate and as such these will look better on a larger TV.
Why is a recently purchased Sharp Aquos showing analog as opposed to digital on the screen display when digital TV service is subscribed and the digital terminal is hooked up to the cableTV?
Did you connect the digital output from the box to the TV? Is the standard RF cable connected too? And did you run the digital tuner setup on your TV? And finally, is your input selector set for the digital signal or analog signal input? One of these should work, unless of course, you're not tuned into a digital feed from the cable company but are watching an analog signal being sent into your box. Not every channel's converted over yet and some signals are only still available in analog. Maybe your cable company's converting the analog signal as well or possibly they haven't set up their digital feeds for a specific channel.
Is a Toshiba 48 theater view tv high definition?
No, it is an analog tv and requires a digital converter box to receive a digital signal off the air. No problem if you have satellite or cable service. Either way, the image will not be HD.
What device is used to convert digital signal to non-digital television set?
If you mean a set top digital box, then you can connect that to any tv.... otherwise..... It doesnt work that way. The digital signal is a part of the analog signal. Just screw the cable wire on to the back of your tv.
Motorola digital cable box?
A Motorola digital cable box is used to changed an analog television to digital viewing. The cable box needs to be connected to a receiver such as a roof antenna and then to the television. The television then has to scan the box to locate signals that it can receive.
Do they make a digital audio cable that fits older receivers?
It's not as simple as making a cable that fits. Digital audio cables and digital signals, both coaxial and optical, require a digital input. You need to convert the digital signal to analog to work with older receivers. These are available (Google Digital to Analog Converter or DA Converter). Just about every device that has a digital output will also have an analog stereo output, which will work with your old gear.
